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Thread: 535i intake gasket problem
02-07-2011 11:04 PM #1
02-08-2011 04:25 PM #2
02-09-2011 06:49 AM #3
02-09-2011 06:38 PM #4
02-10-2011 09:05 AM #5
Re: 535i intake gasket problem
Talked to an older BMW master tech last night and here is the probable scenario.
I reused the old wave washers which had lost some of their spring. Over time the length of the intake and the heat/cooling cycles makes the outer cylinders flex a bit which with the older washers made the nuts back off a bit. Eventually they back off enough to cause a slight vacuum leak which then caused a backfire, thus the blowing of the gasket to the outside. Solution, don't reuse older fasteners or washers. Rookie mistake on my part.
04-14-2012 02:44 PM #6
I have had the same troubles on my '92 535im. I think you're correct, that anything causing a backfire into the intake will blow out the gaskets. In my case, it was a bad O2 sensoer which caused a stumble at throttle tip-in. Although I felt the stumble, I couldn't hear the backfire, since it is not very loud. Once, I had the hood open, and heard it, it sounds oddly like a sneeze.
Anything which causes a lean condition to the engine should be prevented, as it seems these cars have vulnerable intake gaskets.
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